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  1. #1
    Daniel Leung's Avatar
    Daniel Leung Guest

    Default PVC or CPVC vent pipe on tankless heater?

    I need heating/plumbing experts' comments. Can you see the problem on these vent pipe materials in a new house in Canada?

    When checking the page 34 of installation manual, it recommended Type-BH Class IIB (PVC) in Canada. Is it an error of CPVC?

    I am not a plumber, but I think IIA is white PVC up to 65C(150F) and IIB is grey CPVC up to 90C(195F). Also I think PVC and CPVC vent pipe cannot be mixed together other than using the CPVC glue. Please correct me if wrong.

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  2. #2
    Join Date
    Jun 2008
    Location
    Maryland
    Posts
    1,049

    Default Re: PVC or CPVC vent pipe on tankless heater?

    The manual says recommended. It does not say required.

    My non-expert opinion is it would be unlikely that any problems would result from the use of that grey CPVC section used for venting that WH.


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